<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box {
        width: 500px;
        height: 500px;
        background-color: #ccc;
        color: #fff;
        text-align: center;
        font-size: 100px;
      }
    </style>
  </head>

  <body>
    <div class="box"></div>
    <div class="box1"></div>
    <script src="./lodash.min.js"></script>

    <script>
      const box = document.querySelector('.box')

      let num = 0
      function addNum() {
        num++
        box.innerHTML = num
      }

      box.addEventListener('mousemove', _.throttle(addNum, 1000))
      //   box.addEventListener('mousemove', _.debounce(addNum, 1000))
    </script>
  </body>
</html>
